Be on same wavelength and Tack on

Tack on and be on same wavelength are semantically related. In some cases you can use "Tack on" instead a verb phrase "Be on same wavelength".

Tack on verb - To join (something) to a mass, quantity, or number so as to bring about an overall increase.

Be on same wavelength and tack on are semantically related. Sometimes you can use "Be on same wavelength" instead a verb "Tack on".